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    Company Confidential

    1 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials

    (E)GPRS Network Infrastructure

    GPRS IPBackboneNetwork

    DNS

    CG

    GGSN

    Internet

    Corporate 1Intranet

    LIG

    Corporate 2Intranet

    SS7Network

    PSTNMSCBSCBTS

    MS

    EIR

    HLR/AuC

    SMS-GMSC

    SGSN

    SGSN

    SGSN

    MODEMPOOL FOR DIALUP

    Nokia IP650sec GW

    Router

    Router

    RouterSTM-1

    STM-1

    SGSN

    GGSN

    Router

    Router

    NokiaSecurity GW

    LANSWITCH

    MODEMPOOL FOR DIALUP

    NokiaSecurity GW

    NokiaSecurity GW

    Nokia IP650sec GW

    Nokia IP650sec GW

    NokiaSecurity GW

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    BSC

    Metro

    Hub

    SGSN

    GGSN

    ELECTRICAL ET

    GB LINKGB LINK

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    NSEI 1 NSEI 2

    NSEI 3

    NSEI 4

    NSEI PLANNING

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    Network Element and Configuration Audit - Summary

    BSCGGSN

    IP/MPLS/IPoATM-

    Applicatio

    n Servers(co-

    located

    2GSGSN

    BTS

    HLR/AC/

    EIR

    TCSM

    TC

    MSC/VLR

    Abis GbBSC

    BSCGGSNGGSN

    -backbone

    ApplicationServers

    2G

    SGSN

    2G

    SGSNBTS

    HLR/AC/

    EIR

    HLR/AC/

    EIR

    TCSM

    TC

    MSC/VLR

    GnGi

    Gs

    RF interface

    Coverage

    C/I

    Capacity

    Traffic volume

    Mobility

    MS/Clientparameters

    GPRS/EDGEcapability andrelease

    Multislot support

    Abis interface

    EDAP size /dimensioning

    # of E1/T1s

    GPRS/EDGEtraffic

    Gb interface

    Bearer size IP v.s. FR

    Dimensioning

    BTS

    GPRS territory

    BTS HWconsiderations(TRX & BB-card)

    BTS SW(EPCR)

    BSS

    PCU variant &dimensioning

    PCU strategyin mixedconfiguration

    BSS SW andfeatures

    SGSN

    Unit capacity(PAPU etc.)

    BSS Gb Flowcontrol

    RF

    Server

    load

    settings(Linux/Win)

    HLR

    QoS profile

    GPRS settings

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    INPUT GIVEN FOR THE GPRS PLANNING

    No. of time slot required for the GPRS territory : CDED=1 and CDEF=1

    No. of BTS per EDAP i.e the No. of sectors prevalent : 3 No. of time slot used for EDAP on Abis (64 Kbps) : 3 Time slot

    % of upgrade is the Teritory upgrade for the future perspective : 10 %

    No. Of sites planned per BSC : 100

    Access rate (CIR) is the speed required at the GB interface : 256 Kbps

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    OUTPUT REQUIRED

    No. of sites per NSEI required

    No. of NSEI required in BSC No. of PCU or No. Of BCSU required

    No. Of Gb Link required

    No. of E1 required from the BSC to Metro Hub

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    How to calculate what

    No. of EGPRS resources used in 1 sector * No. of sectors : 2 x 3

    No. of time slot/sector * no of time slot used for EDAP :- 2 * 3 = 6 So total time slots per site 6 + 6 = 12

    1 NSEI support 256 time slot with upgrade % as 10 so total no of time slots which

    can be equipped is 256 - 10% of 256 = 230.4 ~ 230

    So no. of sites per NSEI is 230/12 = 19.16 ~ 19

    So no NSEI required / BSC : 100 / 19 = 5.2 +1 (for future use) ~ 6

    2 NSEI supports 1 BCSU so no. of PCU required : 6/2 = 3

    No. of NSEI required is equivalent to the no. of Gb link = 3

    On 1 E1 we can get 31x64 = 1984 , so access rate can be given by 1 E1 = 1984/

    access rate (256) = 1984 / 256 ~ 7

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    Coding scheme Data rate

    MCS-1 8.8 kbit/s

    MCS-2 11.2 kbit/s

    MCS-3 14.8 kbit/s

    MCS-4 17.6 kbit/s

    MCS-5 22.4 kbit/s

    MCS-6 29.6 kbit/s

    MCS-7 44.8 kbit/s

    MCS-8 54.4 kbit/s

    MCS-9 59.2 kbit/s

    Abis PCM allocation (fixed + pool)

    ransm ss on requ remen orEGPRS coding schemes in Abisinterface

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    EDGE modulations

    Scheme Modulatio

    n

    Maximum rate [kb/s]

    MCS-9 59.2

    MCS-8 54.4

    MCS-7 44.8

    MCS-6 29.6 / 27.2

    MCS-5

    8PSK

    22.4

    MCS-4 17.6

    MCS-3 14.8 / 13.6

    MCS-2 11.2MCS-1

    GMSK

    8.8

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    GPRS & EGPRS coding schemes

    GPRS has four coding schemes,

    CS-1...4. All use GMSK.

    EDGE has nine modulation and coding schemes, MCS-1...9.

    MCS-1...4 use GMSK,

    MCS-5...9 use 8-PSK modulation

    Operator can set the MCS to start with

    E.g. always start with MCS-9

    MCS-7

    MCS-1

    22

    MCS-228

    MCS-3

    37

    MCS-4

    44

    MCS-5

    56

    MCS-6

    74

    5656

    MCS-8

    6868

    MCS-9

    74 74

    redundancy from

    channel coding

    RLC data block,number of octets

    RLC/MAC block

    (radio block)

    CS-1

    20

    CS-2

    30

    CS-3

    36

    CS-4

    50

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    EDGE link performance

    GPRS with re-transmission with same coding scheme

    Retransmissions with EDGE can be sent with the new scheme

    Bit Error Probability (BEP) is a new MS quality measurement introduced

    In general, a higher coding scheme has higher coding rate, and consequently higherpeak throughput, but it also tolerates less noise or interference.

    New parameters

    Max BLER for Ack and Non-Ack modes

    Can be used to tune to use more higher MCSs

    Mean BEP offset for GMSK and 8-PSK

    Set threshold for MCS change

    The figure shows throughput vs. C/I of EGPRS coding schemes in TU50iFH, without

    incremental redundancy.

    0

    10

    20

    30

    40

    50

    60

    0 5 10 15 20 25 30

    MCS-1

    MCS-2

    MCS-3

    MCS-4

    MCS-5

    MCS-6

    MCS-7

    MCS-8

    MCS-9

    Ideal Link AdaptatiIn RLC layer (kbit/TSL)

    C/I

    )

    http://nea.ntc.nokia.com/~neva/PMWG_2GBSS/GPRS_territory.htm
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    GPRS: territory (S9-10)

    AVG. AVAILABLE TCH in CS territoryava_15 (S9)ave_avail_TCH_sum/ ave_avail_TCH_den

    AVG. AVAILABLE GPRS CHANNELS in PS territoryava_16 (S9)ave_GPRS_channels_sum/ave_GPRS_channels_den

    AVG. AVAILABLE DEDICATED GPRS CHANNELSava_17 (S9)ave_GPRS_channels_sum/ave_GPRS_channels_den

    PEAK DEDICATED GPRS CHANNELS

    /c2066(S9)peak_permanent_gprs_ch

    PEAK GPRS CHANNELS

    /c2063(S9)peak_gprs_channels

    Used capacity for GPRS

    The following are the operator configurable parameters for territory

    management:

    GPRSenabled (BTS-level)

    GPRSenabledTRX (TRX-level)

    DedicatedGPRScapacity (BTS-level)

    DefaultGPRScapacity (BTS-level)

    PreferBCCHfreqGPRS (BTS-level)

    TerritoryUpdateGuardTimeGPRS (BSC-level)

    GENA

    GTRX

    CDED

    CDEF

    BFG

    GTUGT

    ADDIT.GPRSCH USED

    ach_1

    UNAVAILABLE

    TCH

    c2040

    AVG. BUSY TCH = CS traffictrf_12bave_busy_tch/ res_av_denom14

    AVG. TSL used for UL GPRS trf_78b

    AVG. TSL used for DL GPRS trf_79b

    Free capacity

    Allocated resources

    Usedresources

    CDEDCDEF

    Used capacity for speech

    Availability ava_1d

    The main principle is thatGPRS (PS) uses the capacity

    that remains from the CStraffic.

    Given as % over dual TCH tsls of

    GPRS enabled TRXs.

    Includes dedicated time slots.

    Rounded downwards.

    Circuit Switched traffic has priority

    In each cell Circuit Switched & Packet Switched territories are defined

    Territories consist of consecutive timeslots

    TRX 1

    TRX 2

    CCCH TS TS TS TS TS TS TS

    TS TS TS TS TS TS TSTS

    DedicatedGPRS

    Capacity

    CircuitSwitchedTerritory

    PacketSwitchedTerritory

    Territory border movesDyn a m ica lly based onCircuit Switched traffic load

    CircuitSwitchedcapacitynotaffected

    byintroducingGPRS

    DefaultGPRS

    Capacity

    AdditionalGPRS

    Capacity

    DL D t S h d li E l N d t

    http://nea.ntc.nokia.com/~neva/PMWG_2GBSS/GPRS_territory.htmhttp://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?ava_15http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?ava_15http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?ava_16http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?ava_16http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?ava_17http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/counters?002066http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/counters?002063http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?ava_15http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?ava_15http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?ava_16http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/params?942http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/params?962http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/params?940http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/params?941http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/params?943http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/params?949http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?ach_1http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/counters?2040http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?trf_12bhttp://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?ava_15http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?trf_78bhttp://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?trf_79bhttp://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/params?940http://essrv509ntc.ntc.nokia.com:6336/dynaweb/NED31_bsc_s9e/0031312/@ebt-link;nh=1;pt=46768;uf=0?root=%25N%15_46776_START_RESTART_N%25;stylesheet=table.rev;window=new;title=%22Table+124%3A+%22;__prev_hit__=46773;DwebQuery=CDEFhttp://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?ava_1dhttp://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?trf_12bhttp://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?ava_15http://essrv509ntc.ntc.nokia.com:6336/dynaweb/NED31_bsc_s9e/0031312/@ebt-link;nh=1;pt=46768;uf=0?root=%25N%15_46776_START_RESTART_N%25;stylesheet=table.rev;window=new;title=%22Table+124%3A+%22;__prev_hit__=46773;DwebQuery=CDEFhttp://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/params?940http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?ava_17http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?ava_1dhttp://essrv509ntc.ntc.nokia.com:6336/dynaweb/NED31_bsc_s9e/0031312/@ebt-link;nh=1;pt=46768;uf=0?root=%25N%15_46776_START_RESTART_N%25;stylesheet=table.rev;window=new;title=%22Table+124%3A+%22;__prev_hit__=46773;DwebQuery=CDEFhttp://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/params?940http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?trf_79bhttp://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?trf_78bhttp://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?ava_15http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?trf_12bhttp://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/counters?2040http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?ach_1http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/params?949http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/params?943http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/params?941http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/params?940http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/params?962http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/params?942http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/counters?002063http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/counters?002066http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?ava_17http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?ava_16http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?ava_16http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?ava_15http://nea.ntc.nokia.com/cgi-bin/cgiwrap/neva/frmls?ava_15http://nea.ntc.nokia.com/~neva/PMWG_2GBSS/GPRS_territory.htm
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    RTSL

    RequestsTRX 10 1 2 3 4 5 6 7

    - - CS-2 MCS-1 MCS-9 MCS-7 MCS-1 MCS-7

    Grants- - CS-2 MCS-1 MCS-9 MCS-7 MCS-1 MCS-7

    PCMT

    SL

    PCM subTSL1 2 3 4

    8

    11

    10

    9

    5

    2

    5

    -

    5

    -

    -

    -

    7 7 7 -

    4 4 4 4

    There are enough EDAP resources to handle adequately all the TBFs andMCS requests. (e.g PS Active EGPRS ch < EDAP resources)

    DL Data Scheduling ExampleNo need toshare case

    DL D t S h d li E l ( h i )

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    DL Data Scheduling Example (sharing case)

    Grants

    RTSL

    RequestsTRX 10 1 2 3 4 5 6 7

    - - CS-2 MCS-5 MCS-9 MCS-8 MCS-1 MCS-7

    - - CS-2 MCS-5 MCS-7 MCS-7 MCS-1 MCS-6PCU-TRX 0

    5

    2

    35

    7

    5

    7

    44 4 -PCMT

    SL

    PCM subTSL

    1 2 3 4

    11

    12

    10

    -

    Because EDAP is a shared resource between a higher number of EGPRSTSL it is possible to encounter the situation where there are not enough EDAP

    resources to handle adequately all the TBFs (e.g PS Active EGPRS ch >EDAP resources)

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    EDAP utilization

    TRX 2

    TRX 1

    TS TS TS TS TS TS

    TS TS T TS TSTS TS TSSPBCCHBCCH

    TSTS

    TS

    TS

    Dedicated EGPRS TSL

    Default territoryEGPRS TSL

    6 EGPRS RTSLs (Dedicated + Default territory)

    50 % utilization assumed (3 Data Erlangs traffic) On average 3 RTSLs used

    RTSLs use MCS7 (44.8 kbit/s) with average C/I=13dB and throughput30kbit/s

    Effective data rate factor excluding retransmissions over the air-interfaceis 30/44.8 ~ 0.7

    Slave group utilization is 0.7*0.5= 0.35

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    PLAN A PLAN B

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    SNO PLAN A PLAN B

    1

    Both Non BCCH and

    BCCH Trx can access the

    EDGE Facility

    Only BCCH TRX can access the

    EDGE facility

    2

    If the BCCH TRX goes

    faulty then also the EDGE

    users can access the N/W

    since the 2nd TRX has

    been defined on the

    EDAP Pool

    If BCCH TRX goes faulty then The

    EDGE Service can not be accessed

    since the 2nd TRX has not been

    defined on the EDAP POOL

    3

    Using this plan we canchange the BFG priority

    depending on the

    Interference in the N/W

    We can not change the BFG unstill and

    unless the EDAP pool need to be

    redesigned

    4

    In case of extending the

    time slot of EDGE in Non

    BCCH TRX also can be

    done if congestions is

    observed in the Site

    We can not extend the Non BCCH

    TRX time slot during the congestion

    since that TRX is not mapped on the

    EDAP Pool

    5

    While expanding the N/W

    from the 222 to 332

    configuration we need to

    Modify the EDAP pool

    Need not to modify the EDAP pool

    since only BCCH TRX is being mapped

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    Conclusion

    The No. of sites per NSEI depend on the EDAP pool size and no. of time slot

    used for the GPRS territory

    Beside if we need to extend the resourced at ABIS end we need to defince the

    EDAP pool

    If we require the Speed at GB we need to go to higher CIR